Explanation
O.N. of metals in metal carbonyls is zero
O.N. of Ni changes from 0 to +2 and hence Ni acts as a reducing agent
O.N. of P in H3PO3 (phosphorous acid)
3 × 1 + x + 3 × (‒ 2) = 0 or x = + 3
In orthophosphoric acid (H3PO4), O.N. of P is +5,
In hypophosphorous acid (H3PO2) it is +1 while in metaphosphoric acid (HPO3), it is +5.
In CO2, the O.N. of C, i.e., + 4 is already the maximum and it cannot increase its O.N. further and hence does not act as a reducing agent
The O.N. of metal in metal carbonyls is zero.
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